Question

Cu ions released from the copper releasing IUDs to
a. Suppress sperm motility
b. Make uterus unsuitable for implantation
c. Suppress fertilising capacity of sperms
d. Make cervix hostile to sperms

• A. a, b, c, and d
  
• B. a and c
  
• C. a and b
  
• D. b and d
  

Answer 1

The correct option is B a and c


Mechanism of Cu-releasing IUDs :
Copper releasing IUDs releases copper ions in the uterus where they suppress the motility of sperms so that they cannot swim and reach the fallopian tube for fertilisation.
1) They also reduce the fertilising capacity of sperms.
2) They increase phagocytosis of sperms within the uterus.

Mechanism of Hormone releasing IUDs :
Hormone releasing IUDs work entirely differently than Copper releasing IUDs.
1) They make the cervix hostile by making the mucous thick and sticky due to which sperms will not be able to reach the uterus.
2) They also change the environment of the uterus making it unsuitable for implantation of the embryo.

Final answer :
(C) a and c